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Daylighting Research Laboratory (RadiantLab)

The RadiantLab is a daylighting and architectural lighting research laboratory at Oregon State University, led by Dr. Clotilde Pierson, advancing knowledge on how light in buildings affects human health, well-being, and energy use.

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# Daylighting Research Laboratory (RadiantLab)

> The RadiantLab is a daylighting and architectural lighting research laboratory at Oregon State University, led by Dr. Clotilde Pierson, advancing knowledge on how light in buildings affects human health, well-being, and energy use.

## Principal Investigator

Dr. Clotilde Pierson is an Assistant Professor of Architectural Engineering in the School of Civil and Construction Engineering at Oregon State University.

- ORCID: https://orcid.org/0000-0001-7847-6568
- Google Scholar: https://scholar.google.com/citations?user=X8aroEgAAAAJ
- ResearchGate: https://www.researchgate.net/profile/Clotilde-Pierson
- LinkedIn: https://www.linkedin.com/in/clotilde-pierson/
- Email: clotilde.pierson@oregonstate.edu

## Research Themes

1. Built environment to indoor light: How do building design, glazing technologies, urbanization, and climate change affect indoor light and visual conditions?
2. Indoor light to occupant health: How does light exposure affect circadian rhythms, sleep, cognitive health (including dementia), comfort, and well-being?
3. Energy and daylighting: How can daylighting strategies reduce energy consumption while maintaining occupant comfort?

Current priority: the relationship between light exposure, circadian disruption, and dementia/cognitive decline.

## Facility

The Daylighting Innovation and Analysis Lab (DIAL) is a first-of-its-kind mobile daylighting research facility at Oregon State University. It is a trailer-based, ADA-compliant laboratory with electrochromic windows, spectral sensors, and off-grid solar/battery power.

## Software

- Lark Spectral Lighting v2.0: https://github.com/larkspectral/Lark_Spectral_Lighting
- HDRI Calibration Interface v3.1.0: https://github.com/clopierson/HDRICalibrationTool

## Key Journal Publications

- Orman A., Safranek S., Pierson C. (2025). Evaluation of spectral light simulation tools for prediction of ipRGC-influenced light responses. Journal of Building Performance Simulation. DOI: 10.1080/19401493.2025.2515123
- Quek G. et al., Pierson C. (2023). Comparison of questionnaire items for discomfort glare studies. Lighting Research & Technology, 55(7-8). DOI: 10.1177/14771535231203564
- Pierson C., Aarts M., Andersen M. (2022). Validation of spectral simulation tools for ipRGC-influenced light responses. Journal of Building Performance Simulation, 16(2). DOI: 10.1080/19401493.2022.2125582
- Wienold J. et al., Pierson C. (2019). Cross-Validation and Robustness of Daylight Glare Metrics. Lighting Research & Technology, 51(7). DOI: 10.1177/1477153519826003
- Pierson C., Cauwerts C., Bodart M., Wienold J. (2020). Tutorial: Luminance Maps for Daylighting Studies from HDR Photography. LEUKOS, 14(3). DOI: 10.1080/15502724.2019.1684319

## Team

Current members: Kianoush Vali (PhD, light and sleep/health), Yahya Sogodok (MS, non-visual responses), Nima Ghorbanian Matloob (MS, non-visual effects), Isaiah Pileggi-Epps (undergrad), Keean Balsiger (undergrad)
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